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An optimization method is used to select the wavenumbers k for the inverse Fourier transform in 2.5D electrical modelling. The model tests show that with the wavenumbers k selected in this way the inverse Fourier transform performs with satisfactory accuracy.

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This paper presents a new approach to potential field continuation using integral and iteration methods. We vertically project the values of a potential field measured on an undulate surface as an initial values of the field observed on a horizontal plane below the surface. With the initial values on this horizontal plane, the potential field on the surface can be calculated using an integral operator. A correction is then made in the potential field on this horizontal plane based on the difference between the observed and calculated values of potential field on the original surface. The process is iteratively repeated until the corrections become negligible. According to the potential fields on this horizontal plane, we can calculate the potentials on any surface or horizontal plane above this horizontal plane using integral operator or other algorithms. The principle of this method is very simple. It does not require solving algebraic equations and possesses a high computation speed. This method is specially suitable for downward continuation of potential field and achieves a good result. Two practical cases are given in this paper.

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